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TROUBLESHOOTING
Product: JH 21C06
COMMON ERRORS:
If for some reason there should be something wrong with the picture quality or no picture present, check
the symptoms carefully and try to cure it with the hints below:
NO PICTURE / LED BEHAVIOUR:
Power Switch and computer power switch should be in the ON position. The signal cable should be
completely connected to the video card/computer. Check the connector for bent or pushed-in pins. If the
LED in front is red, no external VGA signal is present. If there is no light at all in the LED, no power is
present to the unit. Check your external power source. A lack of image is most likely to be caused by
incorrect connection, lack of power, failure to provide a signal or incorrect graphic card settings.
SCROLLING / UNSTABLE IMAGE:
Signal cable may not be completely connected to computer or CRT monitor.
Check the pin assignments and signal timings of the display and your video card with respect to
recommended timing and pin assignments. Make sure that the video card is compatible and that it is
properly seated / installed on the computer.
DISPLAY AREA IS NOT CENTERED / SIZED CORRECTLY:
Make sure that a supported video mode has been selected on the display, or on the video card / system.
If it is impossible to position the image correctly, ie the image adjustment controls will not move the image
far enough, then test it again using another graphics card for the PC system. This situation can occur
with a custom graphics card that is not close to standard timings or if something is in the graphics line
that may be affecting the signal, such as a signal splitter (please note that normally a signal splitter will
not have any adverse effect).
IMAGE APPERANCE:
A faulty CRT tube can have black lines, failed sections, flickering or flashing image.
Incorrect graphics card refresh rate, resolution or interlaced mode will probably cause the image to be
the wrong size, it may scroll, flicker badly or possibly even no image is present. Sparkling on the display
may be a faulty CRT tube signal cable.
CONTINUED FAILURE:
If unit after unit keeps failing, consider and investigate whether you are short circuiting the equipment or
doing something else seriously wrong.
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Product: JH 21C06
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